With a distance vector routing protocol like RIPv1, when is a route in the routing table placed in the “possibly down” state?
A. when a router receives an update from its neighbor router about a network in its routing table but with a worse metric
B. when a router receives an update from its neighbor router about a network in its routing table but with a better metric
C. when a router receives an update from its neighbor router indicating that a previously accessible network is now inaccessible
D. whenever the router receives an update from its neighbor about a newly learned network
E. whenever the router interface that is used to reach the remote network goes down
